Add sign in backend

WebApp/DTOs/LoginDto.cs

@@ -0,0 +1,9 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace WebApp.DTOs;
+
+public record class LoginDto
+(
+    [Required] string Email,
+    [Required] string Password
+);

WebApp/Endpoints/AuthEndpoints.cs

@@ -0,0 +1,66 @@
+using Microsoft.EntityFrameworkCore;
+using System.Security.Cryptography;
+using System.Text;
+using WebApp.Data;
+using WebApp.DTOs;
+using WebApp.Entities;
+
+namespace WebApp.Endpoints
+{
+    public static class AuthEndpoints
+    {
+
+        public static RouteGroupBuilder MapAuthEndpoints(this WebApplication app)
+        {
+            var group = app.MapGroup("auth")
+                                        .WithParameterValidation();
+
+            group.MapPost("/login", async (LoginDto dto, ApplicationDbContext context) =>
+            {
+                var user = await context.WebUsers.FirstOrDefaultAsync(u => u.Email == dto.Email);
+                if (user == null)
+                {
+                    return Results.Json(new {message = "Wrong email or password."}, statusCode: 401);
+                }
+
+                string hashedPassword = HashPasswordSHA512(dto.Password);
+
+                if(user.Password != hashedPassword)
+                {
+                    return Results.Json(new { message = "Wrong email or password." }, statusCode: 401)
+                }
+
+                var token = new Token
+                {
+                    UserId = user.UserId,
+                    Value = "lah-" + Guid.NewGuid().ToString(),
+                    ValidUntil = DateTime.UtcNow.AddDays(7),
+                };
+
+                //context.Tokens.Add(token);
+                //await context.SaveChangesAsync();
+
+                return Results.Ok(new
+                {
+                    message = "Login successful.",
+                    token = token.Value
+                });
+            });
+
+            return group;
+        }
+        
+        static string HashPasswordSHA512(string password)
+        {
+            using (var sha512 = SHA512.Create())
+            {
+                byte[] bytes = Encoding.ASCII.GetBytes(password);
+                byte[] hash = sha512.ComputeHash(bytes);
+                string hashstring = BitConverter.ToString(hash).Replace("-", "").ToLower();
+
+                Console.WriteLine($"Hashed Password: {hashstring}");
+                return hashstring;
+            }
+        }
+    }
+}

WebApp/Program.cs

@@ -52,5 +52,6 @@ app.UseRouting(); // Enables routing to match incoming request to endpoints
 // Map Minimal API Endpoints
 app.MapEventsEndpoints();
 app.MapOrganizationsEndpoints();
+app.MapAuthEndpoints();
 
 app.Run();